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Unlocking Procedure
As soon as the unlock button on the identification transmitter is pressed, the signal initial-
ly reaches the rear window antenna followed by the remote control receiver. The remote
control receiver is located in the diversity module and forwards the signal to the CAS2.
The signal from the identification transmitter is verified in the CAS2. If the signal is recog-
nized as valid, the JBE is enabled for the purpose of unlocking the central locking drive
units. The JBE now activates the relay to trigger the vehicle unlocking procedure.
Locking Procedure
The vehicle can be locked only after the Footwell Module has evaluated the door con-
tacts and the CAS2 signals that the doors are closed.
Using Identification Transmitter
The identification transmitter sends out a coded signal as soon as the unlock or lock but-
ton is pressed.
The signal from the identification transmitter is demodulated and conditioned in the
remote control receiver. This signal is then made available to the car access system 2.
All central locking drive units assume the "lock" position during the vehicle locking proce-
dure. The central locking drive units in the doors additionally assume the "central arrest"
position.
On conclusion of the central arrest procedure, the locking buttons in the doors are
mechanically separated from the central locking drive system. The vehicle can then no
longer be unlocked using the locking buttons in the doors.
The trunk lid can also be opened separately with the identification transmitter.
Center-Lock Button
The vehicle can be locked/unlocked with the center-lock button. The CAS 2 receives a
high signal (battery voltage approx. 12 V) when the center-lock button is not pressed.
The high signal changes to a low signal (approx. 0 V) as soon as the center-lock button is
pressed.
The CAS 2 evaluates the change from the high signal to the low signal and locks/unlocks
the vehicle. The signal from the center-lock button is looped through the Junction Box
Electronics Control Module.
Mechanical Key/Spare Key
The footwell module evaluates the Hall sensors for the lock barrel in the driver's door.
The CAS2 is informed of the change in status via the K-CAN.
The CAS2 enables the vehicle unlocking/locking procedure. The JBE initiates the vehi-
cle unlocking/ locking procedure.
23
E90 General Vehicle Electrical
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